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BIO_new_CMS.html
<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>BIO_new_CMS</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <ul id="index"> <li><a href="#NAME">NAME</a></li> <li><a href="#SYNOPSIS">SYNOPSIS</a></li> <li><a href="#DESCRIPTION">DESCRIPTION</a></li> <li><a href="#NOTES">NOTES</a></li> <li><a href="#BUGS">BUGS</a></li> <li><a href="#RETURN-VALUES">RETURN VALUES</a></li> <li><a href="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#HISTORY">HISTORY</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>BIO_new_CMS - CMS streaming filter BIO</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/cms.h> BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>BIO_new_CMS() returns a streaming filter BIO chain based on <b>cms</b>. The output of the filter is written to <b>out</b>. Any data written to the chain is automatically translated to a BER format CMS structure of the appropriate type.</p> <h1 id="NOTES">NOTES</h1> <p>The chain returned by this function behaves like a standard filter BIO. It supports non blocking I/O. Content is processed and streamed on the fly and not all held in memory at once: so it is possible to encode very large structures. After all content has been written through the chain BIO_flush() must be called to finalise the structure.</p> <p>The <b>CMS_STREAM</b> flag must be included in the corresponding <b>flags</b> parameter of the <b>cms</b> creation function.</p> <p>If an application wishes to write additional data to <b>out</b> BIOs should be removed from the chain using BIO_pop() and freed with BIO_free() until <b>out</b> is reached. If no additional data needs to be written BIO_free_all() can be called to free up the whole chain.</p> <p>Any content written through the filter is used verbatim: no canonical translation is performed.</p> <p>It is possible to chain multiple BIOs to, for example, create a triple wrapped signed, enveloped, signed structure. In this case it is the applications responsibility to set the inner content type of any outer CMS_ContentInfo structures.</p> <p>Large numbers of small writes through the chain should be avoided as this will produce an output consisting of lots of OCTET STRING structures. Prepending a BIO_f_buffer() buffering BIO will prevent this.</p> <h1 id="BUGS">BUGS</h1> <p>There is currently no corresponding inverse BIO: i.e. one which can decode a CMS structure on the fly.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>BIO_new_CMS() returns a BIO chain when successful or NULL if an error occurred. The error can be obtained from ERR_get_error(3).</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>, <a href="../man3/CMS_sign.html">CMS_sign(3)</a>, <a href="../man3/CMS_encrypt.html">CMS_encrypt(3)</a></p> <h1 id="HISTORY">HISTORY</h1> <p>The BIO_new_CMS() function was added in OpenSSL 1.0.0.</p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p> </body> </html>
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